Fix global explorers for NetBSD

On NetBSD sysctl is at /sbin/sysctl, but the default PATH does not
contain /sbin.

cdist/conf/explorer/cpu_cores

@@ -33,6 +33,7 @@ case "$os" in
     ;;
 
     "freebsd"|"netbsd")
+        PATH=$(getconf PATH)
         sysctl -n hw.ncpu
     ;;
 

cdist/conf/explorer/disks

@@ -30,9 +30,8 @@ case $uname_s in
         sysctl -n hw.disknames | grep -Eo '[lsw]d[0-9]+'
     ;;
     NetBSD)
-        PATH="${PATH}:/usr/local/sbin:/usr/sbin:/sbin"
-        sysctl -n hw.disknames \
-        | awk 'BEGIN { RS = " " } /^[lsw]d[0-9]+/'
+        PATH=$(getconf PATH)
+        sysctl -n hw.disknames | awk -v RS=' ' '/^[lsw]d[0-9]+/'
     ;;
     Linux)
         # list of major device numbers toexclude:

cdist/conf/explorer/memory

@@ -30,6 +30,7 @@ case "$os" in
     ;;
 
     *"bsd")
+        PATH=$(getconf PATH)
         echo "$(sysctl -n hw.physmem) / 1048576" | bc
     ;;